6. It is believed that earthquakes arise from the action of earth's internal heat on and through the surrounding crust.

一般认为，地震是由于地球的内热作用于地壳并通过地壳而引起的。 (Surrounding crust 为 on 和 through 两个介词的共有）

7. Anyone who means to advance science must have a capacity for original thought and for action based on that thought.

无论是谁，要想推动科学向前发展，就必须具备创造性思维的能力和在此基础上采取行动的能力。（capacity为其后的两个for介词短语所共有）

8. Further design refinements were made during and following the qualification tests.

在鉴定试验期间和试验结束后，又对原设计作了进一步的改进。(qualification tests 为 during 和 following 两个介词所共有） 

9. He was concerned mainly with the historical relations between and within languages.

他主要研究内种语言之间的历史联系和两种语言本身的历史联系。（本句中，languages为between和within两个介词所共有；而 historical relations 又为 between languages 和within languages两个介词短语所共有、分别重复译出）

10. We use the oceans as highways between the continents and, unfortunately, as a dumping-ground for waste.

人类把海洋当作各大陆之间的桥梁，但遗憾的是，人类也把海洋当作倾倒垃圾的场所。（use the oceans为其后的两个as短语所共有）

11. Fleming proved that penicillin could kill not only staphylococcus bacteria but other kinds also.

弗莱明证实，青梅素不仅能杀灭葡萄球菌，而且也能杀灭其它种类的细菌。（could kill为其后的两个宾语所共有。

在以上各句中，共有成分不管重复译出几次，都采用同一个译词。

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